Atomic Number (# of protons)

63

Mass (amu)

152.0

Density

5.24 g/cm³ (20⁰C, 1 atm)

Electron Configuration

[Xe]4f⁷6s²

Oxidation States (bold = most stable)

+3,+2

Atomic Radius (pm)

199

Ionic Radius (pm)

(+3)107

Electronegativity

1.0

Melting Point (⁰C, 1 atm)

822

Electron Affinity (eV)

Not Available

Boiling Point(⁰C, 1 atm)

1527

1^st Ionization energy (eV)

5.67

Enthalpy of Fusion (kJ/mole)

9.21

2^nd Ionization Energy (eV)

Enthalpy of Vaporization (kJ/mole)

143.5

3^rd Ionization Energy (eV)

Specific Heat Capacity ( J/ (g K), 25⁰C, 1 atm)

0.18